Note! This is a post for beginners in Kotlin language. What are lambdas and anonymous functions? In order to define them let's see what is a function literal. Function literal Function literal is a function that was not declared, but was passed as an expression.
|
1 |
val sum = { a: Int, b: Int -> a + b } |
What functions are 'function literal'? The following are called 'function literal':…
In this post, I will try to explain how to write functions in Kotlin by doing a parallel with Java. It's not rocket science or anything special in this post, but this is the way I understand and remember better how to write in Kotlin, myself (it's something new to me too :) ), so…
Introduction What is Kotlin? It is a new programming language built by JetBrains, and as you may already know, Google announced at Google I/O 2017, that they will now officially support this language. It is inspired by existing languages such as Java, C#, JavaScript, Scala and Groovy. What are the advantages of using Kotlin? it's…
In this tutorial we will create a simple app which has a NavigationView, a Toolbar with Tabs and a simple list of items, that are displayed for each selected tab. Tools used: Android Studio 2.2 Preview 4 Android Emulator 5x API 22 Project Create a new project by choosing the empty template and then click…
Problem I had to implement a Toolbar with tabs, together with CoordinatorLayout, and the content of each tab had to be a list of items, for which I used RecyclerView. But when I ran the app, the first item in the list was overlapped by the tabs, so it was not fully visible. This is how my xml…
Problem Recently I had this issue: my Android Device Monitor didn't open and and an error log file was generated every time I was tring to open it, under Android - sdk - tools - lib - monitor-x86_64 - configuration. Also, I have to mention that it happened on Windows. I googled it and found different answers but none…
About Firebase First of all, you have to know that using AdMob with Firebase is optional, at least for now, and you can still integrate AdMob by importing compile 'com.google.android.gms:play-services' (like in this tutorial). But even if it is optional, it is recommended, as it brings all services like AdMob, Analytics, crash reporting and other services together in just…
In a previous post about Gradle Flavors and Build Types, we mentioned that we can set different dependencies inside dependencies{} block by flavors, by build type or both combined. Below we will see an example for each situation. By flavors <flavorName>Compile
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 |
apply plugin: 'com.android.application' android { compileSdkVersion 23 buildToolsVersion "23.0.3" defaultConfig { applicationId "com.example.diana.buildvariants" minSdkVersion 15 targetSdkVersion 23 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } qa { applicationIdSuffix ".qa" // signingConfigs as debug key needed. Otherwise, the app won't run and it will ask // you to sign the apk signingConfig signingConfigs.debug } } productFlavors { free { applicationId "com.example.myapp.free" versionName "1.0-free" minSdkVersion 23 } paid { applicationId "com.example.myapp.paid" versionName "1.0-paid" } } } dependencies { paidCompile 'com.android.support:design:23.4.0' compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.4.0' compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha3' testCompile 'junit:junit:4.12' androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2' androidTestCompile 'com.android.support.test:runner:0.5' androidTestCompile 'com.android.support:support-annotations:23.4.0' } |
By build type <buildTypeName>Compile>
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 |
apply plugin: 'com.android.application' android { compileSdkVersion 23 buildToolsVersion "23.0.3" defaultConfig { applicationId "com.example.diana.buildvariants" minSdkVersion 15 targetSdkVersion 23 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } qa { applicationIdSuffix ".qa" // signingConfigs as debug key needed. Otherwise, the app won't run and it will ask // you to sign the apk signingConfig signingConfigs.debug } } productFlavors { free { applicationId "com.example.myapp.free" versionName "1.0-free" minSdkVersion 23 } paid { applicationId "com.example.myapp.paid" versionName "1.0-paid" } } } dependencies { qaCompile 'com.android.support:design:23.4.0' compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:appcompat-v7:23.4.0' compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha3' testCompile 'junit:junit:4.12' androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2' androidTestCompile 'com.android.support.test:runner:0.5' androidTestCompile 'com.android.support:support-annotations:23.4.0' } |
By both flavor and build type <flavorName><BuildTypeName>Compile. In this case…
DID YOU KNOW about ConstraintLayout? Definition ConstraintLayout is a new type of layout introduced by Android, similar to RelativeLayout but more flexible, and it is used to position UI elements relative to other UI elements by using constraints. A constraint represent the rules we have to apply in order to position our UI elements relative to…